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+## Don't quote rhs of =~, it'll match literally rather than as a regex.
+
+### Problematic code:
+
+    [[ $foo =~ "^fo+bar$" ]]
+
+### Correct code:
+
+    [[ $foo =~ ^fo+bar$ ]]
+
+### Rationale:
+
+Quotes on the right hand side of `=~` can be used to match literally, so that `[[ $1 =~ ^"$2".* ]]` works even if `$2` contains regex metacharacters. This mirrors the behavior of globs, `[[ $1 = "$2"* ]]`.
+
+This also means that the problematic code tries to match literal carets and plus signs instead of interpreting them as regular expression matchers.  To match as a regex, it must be unquoted.
+
+### Exceptions:
+
+If you do want to match literally just to do a plain substring search, e.g. `[[ $foo =~ "bar" ]]`, you could ignore this message, but consider using a more canonical glob match instead: `[[ $foo = *"bar"* ]]`. 
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